Primacy

What's the primacy? It affects the post season rating raise/drop of players, or is this a random feature?

its how many of the shots for the team the player takes

So what's the effect of that in the game? If the player have a good scoring rating but a low one in primacy he will miss many shots or what?

yeah, thats how it is

So primacy is also linked to the defensive performance or only to the offense?

offence

If primacy have so important impact in a player's offensive performance, wth the primacy rating is not showed with the other normal ratings? I think is a bad mistake from EA. Thanks for the info.

It's not a mistake. It's an attribute that determines how often a player shoots when controlled by the CPU; essentially it determines who the go to guy is, as well as who averages the most points in simulated play.

Oh that's interesting. I didn't quite know all that.